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Author Topic: KMG SS Poweramps  (Read 59531 times)

KMG

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Re: KMG SS Poweramps
« Reply #90 on: June 14, 2012, 11:34:13 AM »
Assembled 5 W PA



joecool85

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Re: KMG SS Poweramps
« Reply #91 on: June 14, 2012, 03:54:51 PM »
WOW!

I'm with Juan, you need to start selling these, that's impressive!!  :tu:

Honestly, I'm not kidding, I'd buy one as I'm sure many others would as well.  Please let me know if you do decide to start selling these as I know of a few places around here that would probably be interested to sell these locally.
Life is what you make it.
Still rockin' the Dean Markley K-20X
"New" amp: Fender Frontman 25 DSP (FM25DSP)
thatraymond.com

KMG

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Re: KMG SS Poweramps
« Reply #92 on: June 17, 2012, 07:13:26 AM »
Assembled micro PA:



bassetrox

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Re: KMG SS Poweramps
« Reply #93 on: June 20, 2012, 08:56:26 AM »
Hi KMG, once again, great work,

and thanks for sharing so liberally.

I've been trying to simulate your 5W PA design to help me better understand it, but I can't get more than a couple of millivolts clean signal. Any idea what I'm doing wrong? I haven't got much experience simulating fets with tx.
http://ampworks.co.uk/ <- Not much to see here yet!!

KMG

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Re: KMG SS Poweramps
« Reply #94 on: June 20, 2012, 10:28:42 AM »
bassetrox, you can use LTspice simulation files from there
http://milas.spb.ru/~kmg/files/projects/fetpa/mp/sim/

bassetrox

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Re: KMG SS Poweramps
« Reply #95 on: June 27, 2012, 05:02:25 AM »
Thanks a lot KMG,
comparing your to mine, I cant see what I was doing wrong :s No worries anyway.

Have you tried any dual rail designs with complimentary pairs of lateral FETs into a tx?


bassetrox, you can use LTspice simulation files from there
http://milas.spb.ru/~kmg/files/projects/fetpa/mp/sim/
http://ampworks.co.uk/ <- Not much to see here yet!!

KMG

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Re: KMG SS Poweramps
« Reply #96 on: June 27, 2012, 06:56:33 AM »
Quote
Have you tried any dual rail designs with complimentary pairs of lateral FETs into a tx?
I tried this prototype, but it has zero temperature drift & I finished experiments with it.
http://milas.spb.ru/~kmg/files/projects/fetpa/nt/FetPaNt.pdf
Also you can try to read this article
http://translate.google.com/translate?hl=en&sl=auto&tl=en&u=http%3A%2F%2Fgtlab.net%2Fgtlab4%2Farchives%2F30

KMG

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Re: KMG SS Poweramps
« Reply #97 on: July 06, 2012, 03:15:01 PM »
Comparision records (made by my friend) of 6V6 PP PA & 5W fet PA:
http://milas.spb.ru/~kmg/files/projects/fetpa/mp/samples/ModS%20-%206V6PP%20vs%20KMG%20FET%205W.rar
They recorded using MOD_S custom amplifier using its own PA & 5W fet PA connected to "Send" jack.
Frequency response of both PA was equalised using Presence & Depth controls.

Recordings are unnamed (numbered) so you can try to estimate "who is who".
« Last Edit: July 06, 2012, 03:16:13 PM by KMG »

KMG

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Re: KMG SS Poweramps
« Reply #98 on: September 11, 2012, 11:57:04 AM »
40W transformer output PA Module.

Partially SMD version.




All through hole version.



Information about both versions  there.
« Last Edit: September 12, 2012, 08:04:24 AM by KMG »

J M Fahey

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Re: KMG SS Poweramps
« Reply #99 on: September 11, 2012, 12:35:00 PM »
Wow!! In-cre-di-ble !!!
Congratulations !!!!
It's way too generous of you sharing such advanced work with us   :tu:

PS: as a side note: your actual physical construction is *so* good, that I thought those were not pictures but some CAD design, go figure  :cheesy:

KMG

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Re: KMG SS Poweramps
« Reply #100 on: September 11, 2012, 02:09:30 PM »
PS: as a side note: your actual physical construction is *so* good, that I thought those were not pictures but some CAD design, go figure  :cheesy:
You're right, it's rendering from SolidWorks.

J M Fahey

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Re: KMG SS Poweramps
« Reply #101 on: September 11, 2012, 04:45:19 PM »
Ouch !!!  :o
You are considered such a good builder, that I thought *in this case* they were "real".
Go figure !!!  8|

KMG

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Re: KMG SS Poweramps
« Reply #102 on: September 24, 2012, 08:29:55 AM »
Mini head project - LND150 based JCM800 preamp + 5W PA.



J M Fahey

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Re: KMG SS Poweramps
« Reply #103 on: September 24, 2012, 01:13:39 PM »
*Very* cool, congratulations !!! :dbtu: :dbtu:

KMG

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Re: KMG SS Poweramps
« Reply #104 on: October 26, 2012, 07:15:33 AM »
I got ordered PCB's for
Micro fet PA with speaker simulator

& mini mixer for it